I know on my A-body, the blower is attached with I believe 3 or 4 bolts. And by heater box are you talking about the thing under the dash or the box in the engine compartment? The one in the engine compartment is just bolts as well.
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1972 Nova 355, 4 spd, rusty but something to drive.
1972 Pro-touring Cutlass S in the works....still
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